Device for removing dust from air



July 23, 1935. H. w.- KNOWLTON DEVICE FOR REMOVING DUST FROM AIR FiledFeb. 27, 1935 Jiarr Wmwz zm,

Patented July 23, 1935 UNITED STATES PATENT OFFICE DEVICE FOR REMOVINGDUST FROM AIR Application February 27, 1935, Serial No. 8,504

6 Claims.

This invention relates to devices for removing dust from air which is tocirculate throughout a room, thus causing said air to be freed of allfine particles and impurities which might be in- 5' jurious to thehealth of workmen in said room.

The object of the invention is to provide an inexpensive apparatus whichmay be used in connection with machines in a mill which create dust,said apparatus being adapted to receive the dust U laden air andseparate the dust from the air, permitting the pure air to circulate inthe room while the dust and other particles may be collected in piles orreceptacles and removedfrom the room.

5' I This object is attained by the mechanism illustrated in theaccompanying drawing.

For the purpose of illustrating the invention, one preferred formthereof is illustrated in the drawing, this form having been found togive satisfactory and reliable results, although it is to be understoodthat the various instrumentalities of which the invention consists canbe variously arranged and organized, and the invention is not limited tothe precise arrangement and organiza- 3 tion of these instrumentalitiesas herein shown and described except as required by the scope of theappended claims.

Of the drawing:

Figure 1 represents an elevation of an apparatus embodying theprinciples of the present invention.

Figure 2 representsda vertical section on line 2, 2, on Fig. 1.

, Figure 3 represents an elevation of a portion of the perforated plateof the rotating drum. 0

Figure 4 represents an enlarged section of line 4, 4, on Fig. 2, and

Figure 5 represents a diagram of the driving mechanism.

Similar characters indicate like parts through-' out the several figuresof the drawing.

In the drawing, I0 is a framework supporting the lower part I I of acasing, the upper part I 2 of which is secured to the lower part I I bymeans of bolts or screws extending through the flanges I on said casingparts.

The casing I I, I2 has openings I4 in the opposite ends thereof.

Within the casing II, I2 is a cylindrical drum I5, the periphery ofwhich is formed of a metal plate I51: provided with very smallperforations I6 extending therethrough.

The metal plate I5: is secured to a plurality of spolEed wheels orspiders I I secured to and rotatable with a rotary shaft I8 mounted inbearings I9 on the framework I0.

The drum I5 is open at both ends, said ends being opposite the openingsI4 in the casing II, I2.

Around the openings I4 and secured to the ends of the casing II, I2 areflexible members of rubber or leather having flanges 2| extending overthe periphery of the drum I5 at opposite ends thereof, thus preventingleakage outwardly from 10 the air passage 22 surrounding the drum I5.

This passage 22 is larger at its inlet end 23 into which the dust-ladenair is forced from the machines which are connected thereto.

The passage 22 gradually decreases in area from its inlet end 23 to itsoutlet end 24.

Extending downwardly beneath the drum I5 is a walled passage 25 open atthe top and bottom through which dust from the passage 22 may bedischarged into a receptacle 26 positioned beneath 20 said passage.

One wall 21 of said walled passage .25 is curved outwardly to connectwith the outer wall of said casing II, and is in the form of a sectionof a cylinder.

Concentric to this semi-cylindrical wall 21 is a rotatable shaft 28mounted in bearings 29 on the framework I0.

Secured to and revoluble with the shaft 28 is a cylindrical member 30having projecting therefrom a plurality of blades 3I of flexiblematerial, the outer ends of which successively contact with theperiphery of the drum I5.

The drum I5 rotates in the direction of the arrow a on Fig. 1 and theclosure member 30, 8| rotates in the direction of the arrow b.

The shafts I8 and 28 may be rotated by any suitable driving mechanism inany desired time relation to each other and at any desired speed.

In the drawing, gears In, 28.1: are shown as indicating one means forimparting rotation to the shafts I8, 28, the gears having intermediategears I8I, I82, meshing therewith and power being applied to the shaftI8 in any well known manner.

To one of flanges 32 surrounding the openings I4 may be secured a bag 33of fine woven mesh which will receive any dust which might possiblyenter the interior of the drum I4 and pass from that end thereof, all asshown at the left of Fig. 2 of the drawing.

The weave of the bag 33 is such as will permit air to pass therethroughwhile preventing the passing of fine particles of dust.

The bag 33 may be clamped to the flange 32 by any suitable means, as forinstance, the band 34. I

As the passage 22 gradually decreases from its inlet end 23 to itsoutlet end 26, the. volume of dust-laden air entering the passage 22 isrestricted in its passage and must find some way to escape which it doesby passing through the perforations i6 into the interior of the drum I!where it may escape into the room free from dust and other particles.

The outlet end 24 of passage 22 is normally closed by the member 30, 3|but when this member 30, 3| is rotated a restricted amount of dust willbe permitted to pass into the dust outlet passage 25.

Some of the air entering the drum l5 will pass outwardly throughperforations IS in the plate lea: and force downwardly the dust inpassage 25 into the receptacle 26 in which it may be removed anddisposed of in any suitable manner.

As the dust-laden air endeavors to enter the drum I5 through theperforations Hi, the dust is liable to collect and form a. film on theperiphery of the drum i5 and this film will further assist in removingthe dust from the air permeating the film.

As the drum l5 rotates in direction of arrow 0 the film on the peripherythereof will be removed therefrom at the outlet end 24 of passage 22 bythe blades 3! of member 30 and will be permitted to enter the dustoutlet 25.

In many mills the air circulating in a room is filled with dust whichgets into the eyes, ears and nostrils of the workmen interfering withtheir work and sometimes causing serious injury to them.

By means of the present invention all these objections are overcome andair circulating throughout the room is constantly kept free of allimpurities.

Should any very fine dust succeed in passing into the interior of thedrum IE it will be collected in the bags 33.

The apparatus is of simple construction, inexpensive to make andoperate, and has many advantages which it is believed will be thoroughlyunderstood without further description.

Having thus described my invention, I claim 1. In an apparatus forremoving dust from air, the combination of an open ended drum providedwith small perforations in the periphery thereof; means for rotatingsaid drum; a walled dust outlet extending downwardly beneath said drumand open at the top; a casing for said drum'provided with openings inits ends opposite the ends of I said drum and having a closed airpassage surrounding said drum with an air inlet at one end andcommunicating at the other end with said dust outlet and a rotaryclosure located between said outlet dust and said air passage.

2. An apparatus as set forth in claim 1, in which said closure consistsof a rotarybladed member.

3. An apparatus as set forth in claim 1, in which said closure consistsof a rotary bladed member which is positioned at the entrance to saiddust outlet from said air passage, the outer ends of the blades of whichare adapted to successively contact with the periphery of said drumduring the rotation of said member.

4. An apparatus as set forth in claim 1, in

